t-line box design problems. need help - Car Audio | DiyMobileAudio.com | Car Stereo Forum


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Old 07-15-2012   #1
 
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Default t-line box design problems. need help

so, i'm having this problem with my t-line design. i want to put this one 8" jbl gt82d in a tline box for my room.
specs for the box:
port length: 6ft
port area: 30-33cu in
fs: 47
line is flattest around 44hz on winisd at 1cu ft

my problem:
the box is tuned to 32hz and i'd like to get it to 44. making the box smaller or changing the port area(smaller) will raise the tuning. if i do that, though, the box gets too small(around .5-.8).



any ideas?
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Old 07-15-2012   #2
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Default Re: t-line box design problems. need help

T-line? WinISD sucks. And it's unable to simulate transmission lines.

In principle it would be quite simple to waste the surplus labour of the world by building temples and pyramids, by digging holes and filling them up again, or even by producing vast quantities of goods and then setting fire to them. (Orwell)
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Old 07-15-2012   #3
 
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Default Re: t-line box design problems. need help

Quote:
Originally Posted by Patrick Bateman View Post
T-line? WinISD sucks. And it's unable to simulate transmission lines.
well then what would you recommend i use? i have it set for ported, seeing how that's all a t-line really seems to be(a ported box with a really long port).
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Old 07-15-2012   #4
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Default Re: t-line box design problems. need help

Quote:
Originally Posted by Patrick Bateman View Post
T-line? WinISD sucks. And it's unable to simulate transmission lines.
I wouldnt use winISD for that. it works fine for sealed, bandpass and ported. but nothing exotic.

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Old 07-15-2012   #5
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Default Re: t-line box design problems. need help

Quote:
Originally Posted by imacf90 View Post
well then what would you recommend i use? i have it set for ported, seeing how that's all a t-line really seems to be(a ported box with a really long port).
that is not what it is, it behaves differently.

look into hornresp. I beleive that will simulate t-lines.

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Old 07-15-2012   #6
 
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Default Re: t-line box design problems. need help

regardless of whether winisd is good or not. 32hz seems like a pretty low tuning. i don't think it would sound all that great. i've been messing with the numbers for a while and it's not fixing anything. i could always take the risk of keeping it the way it is, but i would never know what kind of response ill get out of it.
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Old 07-16-2012   #7
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Default Re: t-line box design problems. need help

try hornresp for modeling:Hornresp


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Regardless, I agree with Baron

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Old 07-16-2012   #8
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Default Re: t-line box design problems. need help

Transmission lines are a different beast than typical vented bass reflex cabinets.

Now you're getting into quarter-wave design, which requires more sophisticated mathematical models to predict response.

Bottom line, if you are willing to spend the effort to read up on it, HornResp is a powerful DIY tool for more exotic alignments. If not, you are wasting your time.
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Old 07-16-2012   #9
 
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Default Re: t-line box design problems. need help

Quote:
Originally Posted by Chaos View Post
Transmission lines are a different beast than typical vented bass reflex cabinets.

Now you're getting into quarter-wave design, which requires more sophisticated mathematical models to predict response.

Bottom line, if you are willing to spend the effort to read up on it, HornResp is a powerful DIY tool for more exotic alignments. If not, you are wasting your time.
alright, thanks. guess ill just stick with the simple stuff. this program reminds me of when i was a kid and looked through my dads old college books with all sorts of equations and everything. always hurt my brain trying to figure it out. the last thing i want to do is study for a couple weeks just to know some basic information about how a woofer will work in a box.
my original design was a pvc ported box.
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Old 07-17-2012   #10
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Default

http://www.mh-audio.nl/TML.asp for a quick calc go here and enter a few spec, very easy


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Quote:
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Regardless, I agree with Baron

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Old 07-17-2012   #11
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Default Re: t-line box design problems. need help

Quote:
Originally Posted by minbari View Post
that is not what it is, it behaves differently.

look into hornresp. I beleive that will simulate t-lines.

Use that program.

ραηςετα
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Old 07-18-2012   #12
 
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Default Re: t-line box design problems. need help

In any event, you'll only able to fee it about 9V RMS, which into a 2.3 DC resistance of that speaker, is about 35 W RMS, lol. That thing has a WHOPPING 3.8mm of Xmax. I think some tweeters now have that much, lol.
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Old 07-18-2012   #13
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Default Re: t-line box design problems. need help

Quote:
Originally Posted by minbari View Post
I wouldnt use winISD for that. it works fine for sealed, bandpass and ported. but nothing exotic.
I wish that were true

Ports are ultra complex - and WinISD doesn't capture that complexity.

Basically if your box has a port, use Hornresp.

In principle it would be quite simple to waste the surplus labour of the world by building temples and pyramids, by digging holes and filling them up again, or even by producing vast quantities of goods and then setting fire to them. (Orwell)
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Old 07-18-2012   #14
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Default Re: t-line box design problems. need help

Quote:
Originally Posted by imacf90 View Post
alright, thanks. guess ill just stick with the simple stuff. this program reminds me of when i was a kid and looked through my dads old college books with all sorts of equations and everything. always hurt my brain trying to figure it out. the last thing i want to do is study for a couple weeks just to know some basic information about how a woofer will work in a box.
my original design was a pvc ported box.
Don't feel bad, I've been doing boxes for almost two decades and half my subs are just complete crap. It's really easy to screw up any of the complex box types, that's the reason that so many band pass boxes sound terrible. There's nothing wrong with band pass, but it's easy to blow it.

Oddly enough, I'd argue that tapped horns are probably one of the easiest box types to get right, because theyre actually less complex than a plain ol vented box.

In principle it would be quite simple to waste the surplus labour of the world by building temples and pyramids, by digging holes and filling them up again, or even by producing vast quantities of goods and then setting fire to them. (Orwell)
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